I'm still relatively new to the game and I was wondering why there are custom huds, like the competitive hud i've been seeing a lot. What makes it different from the original hud other than its style? Clarification on the subject would be greatly appreciated, thank you.

For many pro competitions, custom HUDs may not show any more information than the default HUD does. The typical example is that a bomb timer is not allowed, since the default HUD does not show any indication of how close the bomb is to going off.

I like the Competitive HUD because with the little stick figures you can easily tell how many teammates and enemies are still alive. The stick figures disappear one by one for each person that is dead.

In the vanilla HUD, you have a fixed row of avatars instead. If players three and four die, that means you see one avatar, one avatar, one skull, one skull, one avatar. So you'd have to "scan" the whole line of avatars to understand that in total three players are left.